Method for fabricating silica glass
CA 2246153 C · Owner: Oh, Jeong-Hyun · Inventors: Baik, Young-Min; Oh, Jeong-Hyun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A silica glass fabrication method. The method includes the steps of adding silica and a dispersant to a premix solution obtained by dissolving a monomer for acrylic resin and a cross-linking agent in a distilled water and dispersing themixed solution, and adjusting the pH of the mixture to form a sol; removing airbubbles from the sol and then aging the sol; adding a polymerization initiator to the aging-treated sol, and adjusting the pH of the reaction mixture; pouring thereaction mixture into a mold aging the mixture in an incubator at a high temperature and then gelating the resultant; aging the obtained gel demolding the, aging-treated gel, and then drying the demolded gel; …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed August 28, 1998 and granted November 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.